.cloud {position:absolute;top:0px;left:0px;width:100%;height:100%;background:url(../img/cloud.png) no-repeat;z-index:1;opacity:0.5;}
#cloud2 {z-index:2;}
#mainBody {width:100%;height:100%;position:absolute;z-index:-1;}
.loginbody{background:url(../img/loginbg3.png) no-repeat center center; width:100%; height:585px; overflow:hidden; position:absolute; top:47px;}